What are push notifications? How the pop-up alerts sent by apps, devices, and browsers work

You can get push notifications across devices to alert you of new messages, news, the weather, and more.
milindri/Getty ImagesPush notifications are the alerts that apps send to your phone or computer even when the apps aren't open.
Often appearing at the top or side of your screen, nearly every popular app uses push notifications in some way.
Although most apps don't let you control when you receive push notifications, you can disable them on any of your devices.
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